<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes">

    <Style TargetType="{x:Type materialDesign:PackIcon}" x:Key="SystemAdditionalIcon">
        <Setter Property="Width" Value="25"></Setter>
        <Setter Property="Height" Value="25"></Setter>
    </Style>
</ResourceDictionary>